文章介绍了美国国家大地测量局开发的研用型GPS数据处理软件OMNI，特别是OMNI较强的周跳探测和修复功能。
This paper introduces a GPS data processing software, OMNI, developed by National Geodetic Survey of U. S. , in particular, its strong ability of cycle slip fixing.
文章简要介绍了美国国家导弹防御系统、战区导弹防御系统，着重介绍这两种系统中使用到的红外技术。
In the paper the USA national missile defense system and theater missile defense system were introduced briefly. Infrared technique on missile defense of America were emphatically described.
文章以伊春五营国家森林公园价值评估为例介绍了CVM法的应用，并针对运用CVM法评估我国森林生态旅游产品价值进行了评价。
Taking Wuying National Forest Park in Yichun as an example, the paper introduces the application of Contingent Valuation Method (CVM), and assesses China forest ecological tourism product.
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